High resolution calcareous nannofossil biostratigraphy and paleoecology across the Latest Danian Event (LDE) in central Eastern Desert,Egypt |
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| Affiliation: | 1. Paleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584, CD, Utrecht, The Netherlands;2. Ludwig-Maximilians-University, Munich, Department of Earth and Environmental Sciences, Geophysics, Theresienstr 41, 80333 Munich, Germany;3. Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, WA 6845, Australia;4. Ludwig-Maximilians-University, Munich, Department of Earth and Environmental Sciences, Paleontology and Geobiology, Richard-Wagner-Str. 10, 80333 Munich, Germany;5. Bavarian Environmental Agency, Hans-Högn-Str. 12, 95030 Hof, Saale, Germany;6. Bavarian Environmental Agency, Haunstetter Str. 1 12, 86161 Augsburg, Germany;1. PPP, Département de Géologie, Université de Liège, Allée du 6 Août, B18 Sart Tilman, B4000 Liège, Belgium;2. CNRS, Université Montpellier 2, UMR Botanique et Bioinformatique de l''Architecture des Plantes (AMAP), Montpellier F-34000, France;3. Earth and History of life Division, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, 1000 Brussels, Belgium |
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| Abstract: | A detailed study of the calcareous nannofossil assemblages of latest Danian to early Selandian age from Wadi Qena (the Qreiya-1, Qreiya-2, and Araas sections) in the central Eastern Desert and the Gebel Duwi section at the Red Sea Coast has been carried out to understand the local phytoplankton paleocommunities. For the first time in Egypt four calcareous nannofossil zones (NTp6, NTp7, NTp8, NTp9) and five subzones (NTp7A, NTp7B, NTp8A, NTp8B and NTp8C) were distinguished subdividing the standard NP4 and NP5 zones. The calcareous nannofossil zones were correlated with nannofossil zonations from the Tethyan region (e.g. Tunisia and the Zumaia section, the GSSP for the Danian/Selandian boundary). The calcareous nannofossil assemblages are moderately to well preserved. The event beds are characterized by a dark-brown shaley-marl bed rich in organic carbon and coprolites. Three main assemblages are distinguished: a pre-event assemblage, a transitional assemblage and a post-event assemblage. The paleoenvironments vary from cool eutrophic water below and above the event to warm oligotrophic conditions during the event. The result of this study concludes that the “Latest Danian Event” (LDE) may represent an early Paleocene hyperthermal. |
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